Commercial size of spending wallet (“CSoSW”) is the total business spend of a business including cash but excluding bartered items. Commercial share of wallet (“CSoW”) is the portion of the spending wallet that is captured by a particular financial company. A modeling approach utilizes various data sources to provide outputs that describe a company's spend capacity. Government agencies, procurement departments, and others that patronize small businesses can use CSoW/CSoSW to determine businesses that should be awarded contracts and businesses that should be denied. CSoW/CSoSW may also be used to manage approved vendor lists.